City A population is 68000, decreasing at a rate of 80 per
year City B having population 42000 increasing at a rate of
120 per Year. In how many years both the cities will have
same population
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Answer / naiyer
68000-80*n = 42000+120*n
68000-42000 = 120n+80n
24000 = 200n
n = 120
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